Specifications
A-4
Cisco ONS 15530 Planning Guide
OL-7708-01
Appendix A IBM Storage Protocol Support
Client Optical Power Budget and Attenuation Requirements
PPRC
PPRC (peer-to-peer remote copy) is a facility used in certain IBM disk controllers that allows
synchronous mirroring of data.
XRC
XRC (extended remote copy) is a facility used with certain IBM disk controllers that allows
asynchronous mirroring of data.
GDPS
GDPS (Geographically Dispersed Parallel Sysplex) is a multisite parallel sysplex with sites up to 40 km
apart. It uses custom automation to manage mirroring of critical data and to balance workload for regular
use or for disaster recovery.
Client Optical Power Budget and Attenuation Requirements
Table A-1 shows the client optical power budget and attenuation requirements for the IBM storage
protocols and IBM’s implementation of other common protocols with high-end IBM servers that support
ESCON, FICON, and Fibre Channel. For each protocol, the table shows the transmit power and receiver
sensitivity ranges on the IBM server interface, the transponder type that supports this protocol on the
Cisco ONS 15530, the resulting client loss budget, and what attenuation is required at 0 km. Refer to the
Cisco ONS 15530 Hardware Installation Guide for the transmit powers and receiver sensitive ranges of
the Cisco ONS 15530 transponder interfaces.
Table A-1 Optical Power Budget and Attenuation Requirements with High-End IBM Servers
Protocol
IBM Server
Transmit (dBm)
IBM Server
Receive (dBm)
Cisco ONS 15530
Transponder
Type
Cisco ONS 15530 Client
Loss Budget/Minimum
Attenuation at 0 km
ESCON, SM –3 to –8 –3 to –28 SM Rx: 11 to 16 dB/none
Tx: 23 to 28 dB/–3 dB
ESCON, MM
ETR/CLO, MM
–15 to –20.5 –14 to –29 MM Rx: 4.5 to 10 dB/none
Tx: 24 to 29 dB/–14 dB
FICON, SM/LX –4 to –8.5 –3 to –22 SM Rx: 11.5 to 15 dB/none
Tx: 17 to 22 dB/–3 dB
ATM 155, SM –8 to –15 –8 to –32.5 SM Rx: 4 to 11 dB/none
Tx: 27.5 to 32.5 dB/–8 dB
ATM 155, MM –14 to –19 –14 to –30 MM Rx: 6 to 11 dB/none
Tx: 25 to 30 dB/–14 dB
FDDI, MM –14 to –19 –14 to –31.8 MM Rx: 6 to 11 dB/none
Tx: 26.8 to 31.8 dB/–14 dB
ISC, 1Gbps –3 to –11 –3 to –20 SM Rx: 8 to 16 dB/none
Tx: 15 to 20 dB/–3 dB